Driving mechanism for sewing machines



Aug. 11, 1925.

1,549,025 w. PEARSON DRIVING MECHANISM FOR SEWING MACHINES Filed May 24, 1925 12 x flg.1.

- Invenbr:

allerleans'on,

Patented Aug. 11, 1925.

UNITED STATES WALTER PEARSON, OF WHITMAN, MASSACHUSETTS.

DRIVING MECHANISM FOR SEWING MACHINES.

Application filed May 24,

To all whom it may arm-0cm:

Be it known that I, WALTER PEARSON, a citizen of the United States of America, and a resident of Whitman, in the county of Plymouth and State of Massachusetts, have invented certain new and useful Improvements in Driving Mechanism for Sewing Machines, of which the following is a specilication.

This invention relates to driving mechanism for sewing machines and the like and has for its object the provision of a simple but effective device by which the operator may stop and start the operating mechanism as desired.

The invention consists in providing the frame of the machine with a toothed hub surrounding the driving shaft on which is secured a hand wheel and with the face of which a driving pulley is adapted to engage, said pulley being slidably mounted upon a sleeve surrounding said shaft and moved toward said hand wheel by means of an oscillating member surrounding said sleeve and provided with teeth coacting with the teeth on said hub.

The invention further consists of certain novel features of construction and arrangement of parts which will be understood readily by reference to the description of the drawings and to the claims to be hereinafter given.

For the purpose of illustrating the invention', one preferred form thereof is shown in the drawings, this form having been found to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized, and that the invention is not limited to the precise arrangement and organization of the instrumentalities as herein shown and described, except as required by the scope of the appended claims.

Of the drawings:

Figure 1 represents a plan of a sewing machine embodying the principles of the present invention,

Figure 2 represents a vertical section of same on line 2, 2 on Fig. 1.

Similar characters indicate like parts throughout the several figures of the drawings.

In the drawings, 38 is the frame or casing of a sewing machine such as is fully shown and described in another application 1923. Serial No. 641,242.

The casing 38 has extending from one wall thereof, a hub 43 provided on its outer end with a plurality of teeth 44.

Within the hub 43 is disposed a nonrevoluble sleeve 40 which has slidably mounted thereon a pulley 41 to which rotary movement may be imparted by means of a belt (not shown) from any suitable rotating element. The sleeve 40 extends beyond the inner and outer faces of one of the walls of the casing 38 as shown in Fig. 2.

Within the sleeve 40 is revolubly mounted the shaft 42 having a hand wheel 43 se cured to its outer end beyond the outer end of said sleeve 40 Loosely mounted on the sleeve 40 is an oscillating member'45 having teeth coacting with the teeth 44 on the hub 43*.

This oscillating member 45 is provided with ears 46 carrying a pin 47 by which said member 45 may be connected to any suitable treadle mechanism, whereby the member 45 may be moved about the axis of the shaft 42, thereby causing the pulley 41 to be forced against the inner face of the hand wheel 43.

Both said pulley 41 and hand wheel 43 are provided with friction rings 41 which are adapted to form a driving connection when forced into contact with each other.

An anti-friction device 46 surrounds the sleeve 40, between the member 45 and the hub of the pulley 41, thus permitting said pulley 41 to freely rotate without being frietionally in contact with the end face of the oscillating member 45.

When the pulley 41 is in contact with the hand wheel '43, rotary movement will be imparted to the latter and also to the shaft 42 on which it is mounted.

The opposite end of the shaft 42 has driven thereon, so as to rotate therewith, a cylindrical cam member 47*, having formed therein cam paths 48, 49 and gear teeth 50 formed thereon.

The cam member 47 also has mounted thereon the stud 56, said stud 56, gear teeth 50, and cams 48, 49 being adapted to impart movement to the various devices of the sewing machine, all as fully described in the parent application hereinbefore referred to.

The cam member 47 has formed in one ill) face thereof a cylindrical depression to receive the inner end of the sleeve 40 which accurately fits the cylindrical wall of said depression and around which said cam member 47 X rotates.

The normal position of the various elements is as shown in the drawings with the friction disks 41 separated.

When in this position, no rotary movement is imparted to the driving shaft 42 and the pulley 41 may rotate freely upon said sleeve 40.

\Vhen'it is desired to operate the sewing machine, the operator moves the oscillating member 45 about the axis of the shaft 42, causing the teeth thereon to ride over the inclined faces of the teeth 44, and in doing so, force the member 45, anti-friction device 46*, and pulley 41 toward the hand wheel 43 until the friction rings 41 come into contact, and then the rotary movement of the pulley 41 will be transmitted to the hand wheel 43 and shaft 42. The speed of the hand wheel will be slow at its start and will gradually increase until the full speed.

of the pulley 41 is attained.

As soon as the member 45 is again released, the pulley 41 will separate from the hand wheel 43, returning the elements 45, 46 to their normal position.

By positioning the anti-friction device 46 between the hub of the pulley 41 and the outer end of the oscillating member, the said pulley 41 may rotate freely on the sleeve 40 without aifecting the other moving parts of the machine.

The object of the sleeve 40 is to provide a long bearing for the shaft 42 and also to provide a means on which the movable parts 41, 45, may be mounted free from contact with the revoluble shaft 42.

The sleeve may be made of difierent material from the casing 38 in the hub 43 in which it is mounted and when worn by constant use it may be removed from the casing 38 and replaced by a new sleeve without necessitating the loss of the entire casing as would be the case if the sleeve was formed integral with the casing.

Moreover, by providing this sleeve the movable parts 41, 45 may be mounted thereon and not on the shaft 42 which would be objectionable as the various movable parts would then be more quickly worn out.

As the sleeve 40 extends into the casing and within a recess in the cam member 47 it acts as a bearing for said member.

This makes a very effective means for controlling the operation of a sewing machine or the like, the many advantages of which it is believed will be understood readily without further description.

Having thus described my invention, I claim:

1. In a machine of the class described, a

frame comprising a casing having formed integral therewith a hub provided with a plurality of inclined teeth; a sleeve fixedly mounted in said hub and extending beyond the inner and outer faces of one of the walls of said casing, said sleeve being adapted to be removed from said hub; a shaft revoluble in a bearing formed within said sleeve; a hand wheel secured to the outer end of said shaft; a single power-transmitting member secured to the opposite end of said shaft and provided with a cylindrical depression in which the inner end of said sleeve is disposed; a loose pulley on said sleeve adapted to be removed endwise into contact with said hand wheel; a collar on said sleeve having teeth engaging those on said hub; and means for moving said collar about its axis to force said pulley into frictional contact with said hand wheel by the coaction of said inclined teeth.

2. In a machine of the class described, a frame comprising a casing having a hub provided with a plurality of inclined teeth; a single rotatable actuating element within said casing; a sleeve mounted in said hub and removable therefrom but normally fixed in position; a shaft revoluble in a bearing formed within said sleeve having said actuating element secured to one end thereof, said element being provided with a cylindrical depression to which the inner end of said sleeve is fitted; a driving wheel secured to the opposite end of said shaft; and a loose pulley on said sleeve.

3. In a machine of the class described, a casing of which a vertical wall is provided with a cylindrical opening; a non-revoluble sleeve within said opening and extending beyond the opposite ends thereof; a shaft rotatable in a bearing formed within said sleeve; a driving wheel secured to the outer end of said shaft; a second wheel rotatable on said sleeve; and a single power-transmitting member secured to the inner end of said shaft, said member having a cylindrical depression to receive the inner end of said sleeve and forming a bearing for said member.

4. In a machine of the class described; a casing having a hub in one vertical wall thereof; a non-revoluble sleeve in said hub and removable therefrom, with its opposite ends extending beyond the ends of said hub; a shaft revolubly mounted within said sleeve with its ends extending beyond the ends of said sleeve; driving mechanism for said shaft including a wheel secured to the outer end thereof and aloose pulley revoluble on the outer end of said sleeve; and a single power-transmitting member secured to the inner end of said shaft, said member having a cylindrical depression into which the inner end of said sleeve projects and forms a support for said member.

1 member secured to the inner end of said shaft, said member having a cylindrical depression into which the inner end of said sleeve projects and forms a support for said member.

Signed by me at Whitman, Mass. this 22d 15 day of May, 1923.

WALTER PEARSON. Witness:

VIRGINIA M. PEARSON. 

